Is Cache-Oblivious DGEMM Viable?

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We present a study of implementations of DGEMM using both the cache-oblivious and cache-conscious programming styles. The cache-oblivious programs use recursion and automatically block DGEMM operands A,B,C for the memory hierarchy. The cache-conscious programs use iteration and explicitly block A,B,C for register files, all caches and memory. Our study shows that the cache-oblivious programs achieve substantially less performance than the cache-conscious programs. We discuss why this is so and suggest approaches for improving the performance of cache-oblivious programs.